Rivet heater



RIVET HEATER Filed June 2. 1921 2 Sheets-Sheet 1 Augf 3Q, 1927. l

P. J. CULHANEI. JR

RIvET HEATER Filed June 2. 1921 2 Sheets-Sheet 2 1, IT v////.

Wiliam Afro/Wvg,

'Patented Aug. 30, 1927.`

UNITED vSmart :s

PATENT OFFICE.

:PATRICK J. CULHANE, JR., OF CLEVELAND, OHIO, ASSIGNOR TO THE HYDRAULICSTEEL COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

RIVET HEATER.

Application filed4 June 2,

This invention relates to 'electrical rivet heating devices of the typein which the rivets are clamped between a pair of electrodes and areheated by passing an electric current u through them.

Fig. 2 is a central vertical section throughv the rivet magazineandfeeder.

Fig. 3 is a View showing a vertical section through the magazine andfeeder in l 2e a plane in right angles to that shown in F ig. 2.

Fig. i is a det-ail View of the cut-oilI plate forming a part or thereciprocating iteeder. rllhe rivet-heating mechanism is mounted ee upona carriage 1 and-is of an old and well known type in which the rivetsare clamped between a stationary upper member 2 and a :movable electrodemember 3 which engage opposite ends of the rivets and through :w whichthe electric current passes. The movable electrode 3 is connected bymeans of a rod 4 t a treadle lever 5 to which is attached a treadle 6.Intel-posed between a stationary bracket i" on the carriage and acollar' 8 on :as the rod l is a compression spring 9 which serves tonormally maintain the treadle 6 in elevated position and the electr-ode3 in clamping position.

Secured tothe upper stationary member 2 is a vertical conduit 10 forminga magazine for rivets. The member 2 has a passage 11 registering withthe interior of the conduit 1() for the passage of rivets and isprovided with a transverselyy extending chamber 12,150 receive aslidable rivet feeding and contact orI electrode member 13. The slidingmember 13 has an aperture 14 in the forward end thereof of sullicientdiameter to permit the passage of a rivet when lbrought into alinementwith the conduit 10,

and thel lower wall of the chamber 12 has an aperture 15 registeringwith the conduit 10 and passage 11. The sliding member 13 1921. serialNo. 474,507.

carries a cut-oit plate 16 which tits against the upper wall of thechamber 12 and has a keyhole slot 17, the enlarged portion 18 oywhich is`at the rear end thereotand in register with the passage 11 when themember 131s in forward posit-ion as shown in Fig. 2. Extending acrossthe chamber 12 between the slide 13 ane plate 16 are a pair of crossbars 19 and 20 which prevent movement of the head of the rivet restingon the slide 13 when it is retracted. The sliding member 13 has a guidepin 21 attached to the rear end thereof. The guide pin 21 slides in abracket 22 carried by the stationary member 2. Interposed between thebracket 22 and the slide 13 is a compressionspring which normally holdsthe slide 13 in forward position as shown in Fig. 2., Adjustablyattached to the lower movable electrode 3 and suitably insulatedtherefrom is an operating bar 24 having an outwardly projecting beveledportion 2:3 engaging a correspondingly beveled laterally projectingledge. 26 on the slide 13.

The springs 9 and 23 normally hold the movable elect-rode .3 in clampingposition and the slide' 13 in forward position, as shown in Fig. 2. Whenit is desired to Jfeed a cold rivet to heating position between theelectrodes the operator steps on the treadle @lowering the electrode 8against the action of the spring 9. Qn downward movement of theelectrode 3 the beveled portion 25 of the bar 24: engages the beveledledge 26 on the slide 13 and retracts the slide 13 against the action ofthe spring23 until the aperture 14 inf/the slide 13 registers with thepassage 11, whereupon the rivet resting upon the top of the slide 13drops through the apertures 14.- and 15 into engagement withthe-electrode 3. The movement of the electrode 3 is not suilicient to-tree the upper end of the rivet from the aperture 15 but is sufiicientto clear the upper end ofthe rivet from the slide 13 so that the slidecan move back over the rivet. Rearward movement of the cut-oli' plate 16moves the enlarged portion 18 et the slot 17 out of register with thepassage 11 and brings 'the narrow portion of the slot into a positionstraddling the rivet resting on the slide 13. This allows the rivet onthe slide 13 to drop freely when thel aperture 1li is. brought intoalinement therewith, but presents a barrier against the passage of thehead of the superposed rivet.

When the operator releases the treadle 6 the electrode 3 is raised bythe spring 9, the slide 13 is released and spring 23 forces the slide 13'to rearward position. Upward movement of the electrode clamps the rivetresting thereon against the under surface of the slide 13 and uponcompletion of the rearward movement of the slide 13 the en.- largedportion 18 of the slot 17 again registers with the' passage 11 andpermits the column of rivets to drop until the head of the lowerniostrivet rests upon the slide 13l Having described my invention, what Iclaim is:

1. In a rivet heater, a clamp comprising a pair of opposed electrodes, arivet magazine, means for operating said clamp and a reciprocatingfeeder operably connected to said clamp operating means for transferringrivets from said magazine to said clamp.

2. In a rivet heater, upper and lower rivet clamping electrodes, meansfor moving tlie lower electrodes toward and from the upper electrode, arivet magazine carried by said upper electrode, means for moving saidawer electrode and rivet feeding means operably connected to saidelectrode moving means.

In a rivet heater, upper and lower rivet clamping members carryingelectrical contact members for engaging opposite ends of a rivet, arivet magazine carried by the upper clamping member, the Contact membercarried by the upper clamping member being slidably mounted and movableacross the lower end of said magazine to feed rivets from the magazineinto position between the 'clamping members.

4. In a rivet heater, a stationary clamping member, a clamping memberbeneath the stationary member and movable toward and away therefrom, avertical tube forming a magazine for rivets mounted upon said stationarymember, said stationary clamping member having a passage therethrough inalinement with said tube, a combined feeding and Contact member movableacross said passageway, a spring for moving said feeding member in onedirection, a cam earried by said movable clamping member and engageablewith said feeding member for moving said member in opposition to saidspring and 4means for moving said movable clamping member.

5. In a rivet heater, a rivet magazine coniprising a vertical conduit, avertically movable electrode beneath said conduit, a slidable electrodemember movable transversely across the lower end of said conduit, eutoifmeans carried by said slidable electrode member whereby movement of saidelectrode member permits a single rivet to drop into engagement with thevertically movable electrode member and prevents passage of other iivbtspermitting said slidable electrode member to return to a positionclosing said conduit, means for moving said vertically movable electrodemember and means for simultaneously 'moving said slidable electrodemember.

In testimony whereof, I hereunto alix my signature.

PATRICK J. CULHANE, JR.

